We may boldly say. — Rather, so that we say with courage. The words of the quotation (Psalms 118:6) should be arranged thus: “The Lord is my helper; I will not fear: what shall man do unto me?”
Related Commentaries of Hebrews 13:6
Hebrews 13:6
6 So that we may boldly say, The Lord is my helper, and I will not fear what man shall do unto me.